Jamie and Craig Overton have both signed three-year extensions with Somerset, the club has announced.
The 19-year-old twins have become significant players for the county over the last few seasons.
Fast bowler Jamie’s performances in 2013 earned him a call-up to England’s one-day international squad against Australia.
All-rounder Craig, meanwhile, saw a promising campaign cut short in May by a stress fracture to his back.
Somerset’s director of cricket Dave Nosworthy said: “As a club we are extremely pleased to have secured these two young diamonds.
“Both Craig and Jamie are very highly rated nationally and as west-country lads we are excited to be able help them develop and at the same time to have them performing on the field for us.
“Long-term expectation around these two is high, so it will be key now for them to just keep their feet on the ground and to get the hard yards in.”
The brothers were understandably delighted to put pen to paper.
Craig admitted: “It is an honour to have signed an extension with the club I have always supported and have always wanted to play for.
“It is an exciting time for me and I can’t wait to get back out on the field come the 2014 season.”
Jamie added: “Signing a new three-year deal with Somerset is the cherry on top in terms of what has already happened for me this season.
“I look forward to a long association with the club, and to winning as much silverware along the way as possible.”